Abstract
With ever-increasing concerns for the safety and convenience of the power supply, there is a fast growing interest in wireless power transfer (WPT) for industrial devices, consumer electronics, and electric vehicles (EVs). As the resonant circuit is one of the cores of both the near-field and far-field WPT systems, it is a pressing need for researchers to develop a high-efficiency high-frequency resonant circuit, especially for the mid-range near-field WPT system. In this paper, an overview of resonant circuits for the near-field WPT system is presented, with emphasis on the non-resonant converters with a resonant tank and resonant inverters with a resonant tank as well as compensation networks and selective resonant circuits. Moreover, some key issues including the zero-voltage switching, zero-voltage derivative switching and total harmonic distortion are addressed. With the increasing usage of wireless charging for EVs, bidirectional resonant inverters for WPT based vehicle-to-grid systems are elaborated.
Highlights
With the objectives to achieve no power cables, no sparking hazards, better convenience and high flexibility, wireless power transfer (WPT) has attracted considerable attention in many industrial applications and interdisciplinary areas [1,2,3]
The primary side often shifts away from the nominal resonant frequency slightly to realize a small portion of reactive power, which makes the inverter switches operate in zero-voltage switching (ZVS) or zero-current switching (ZCS)
In order to achieve more flexible operations, such as ZVS, ZCS and ZPA, the LCC compensation was proposed as shown in Figure 8a,b by tuning the compensation network parameters
Summary
With the objectives to achieve no power cables, no sparking hazards, better convenience and high flexibility, wireless power transfer (WPT) has attracted considerable attention in many industrial applications and interdisciplinary areas [1,2,3]. The short-range near-field WPT indicates that the transmitter and receiver are at a distance of a few centimeters based on the two-coil approach. For these short-range applications, the operating frequency of the resonant circuit is usually in the range of 10 kHz to several megahertz [22]. With the increase of the air-gap in the mid-range near-field transmission, less magnetic flux linkage can be captured by the receiver coil [23]. The structure of such coil arrays has been investigated to strengthen the efficiency via stronger resonant coupling in the mid-range near-field applications [26].
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